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10.3. Fonts and Text

The font property has also picked up a few new values in CSS2:


These values give the font property the ability to match the font family, size, weight, and so forth, according to the settings users have specified on their computers. For example, icons on a Macintosh are typically labeled using 9-point Geneva. Assuming that hasn't been changed by the user, any font declaration with a value of icon will result in 9-point Geneva for that text -- as long as the page is viewed using a Macintosh:

SPAN.OScap {font: icon;}  /* will look like icon labels in OS */

On a Windows system, of course, the font would come out different, and under other window managers (like X), it would look different still. The flexibility is certainly interesting, and it allows the author to easily create pages that have an appearance familiar to the user.

10.3.1. New Font Properties

The font section gains two new properties in CSS2. font-size-adjust is intended to help browsers make sure that text will be the intended size, regardless of whether the browser can use the font specified in the style sheet. It is often a problem that authors will call for a font that is not available to the user, and when another font is substituted, it's either too big or too small to read comfortably. This new property addresses that very problem, and should be very useful for authors who want to make sure that their documents are readable no matter what font is substituted.

The other new font property is font-stretch , which allows you to define variable widths for the fonts you use. This is similar to setting a character width in a desktop publishing system. The property uses keywords such as ultra-condensed , wider, and expanded. The changes are handled in a fashion similar to font weights, where a table of condensed and expanded font faces is constructed, and the keywords are assigned to various faces. If no face exists, the user agent may try to scale a font on its own, or it may simply ignore font-stretch altogether. Figure 10-13 shows what a font might look like for each possible value of font-stretch.

Figure 10-13

Figure 10-13. Stretching fonts

In other words, a floating element cannot stick out beyond the edgeof its containing element, unless it's too wide to fit on itsown. This prevents a situation where a succession of floated elementscould appear in a horizontal line and far exceed the edges of thecontaining block. Instead, if a float would stick out of itscontaining block by appearing next to another one, it is floated downto a point below any previous floats, as illustrated by Figure 8-36 (where the floats start on the next line inorder to more clearly illustrate the principle at work here). Thisrule first appeared in CSS2, to correct its omission in CSS1.

10.3.2. text-shadow

In terms of text, there is one new property, text-shadow, which has the effect you'd probably expect from its name: you can define a drop shadow of a given color for text. You can even set an offset and a blur radius, which means you can get cool fuzzy shadows, or even glow effects, using this property. We should fully expect to see this property horribly abused the instant it's supported by any browser; for a few examples of why, see the simulations in Figure 10-14.

Figure 10-14

Figure 10-14. Various effects using the text-shadow property

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element that occurs earlier. Figure 8-34 is an example of this.

Figure 8-34

Figure 8-34. Keeping floats below their predecessors

6. A floating element's top may not be higher than the top of any line box with content that precedes the floating element.

Similar to rules 4 and 5, this further limits the upward floating of an element by preventing it from being above the top of a line